It worked only because of an all-powerful service account on each bot,
which isn't the case any more.

R=sokcevic@google.com

Change-Id: Id66f9cc44cd416e5b61745c0f690d5a91b3b4c67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2225976
Auto-Submit: Andrii Shyshkalov <tandrii@google.com>
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>